$2\left(n-7\right)-3\left(2-6n\right)$
$\frac{dy}{dx}=\frac{y}{x^2-22x+72}$
$\frac{dy}{dx}=\frac{-2y}{x\left(x-2\right)}$
$6n^2-9n$
$-4x+4+6x^2-x+9x^2+8$
$f\left(x\right)=10\left(t^3-9\right)^5$
$\left(121x^2-36y^2\right)\left(11x+6y\right)$
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